noun
brown-irised eyes; beast-like eyes
Refers to eyes with brown irises, often associated in folklore or physiognomy with cruel or beastly people. A somewhat literary or descriptive term.
彼の獣眼が暗闇で光っているように見えた。
His beast-like eyes seemed to glow in the dark.
その男の獣眼には、冷酷さが宿っていた。
Cruelty dwelled in the man's brown-irised eyes.